Connecting Temperature Probes (Hm Versions Only); Flow Sensor - GF PF220 V2 Betriebsanleitung

Operating Instructions
7.1

Connecting temperature probes (HM versions only)

The temperature sensors must be located at the flow and return of the system that is being monitored. The area of pipe where they
are to be attached must be free of grease and any insulating material. It is recommended that any coating on the pipe is removed
so that the sensor has the best possible thermal contact with the pipe .
For optimum reliability on boiler applications, the flow measurement needs to be made on the cold side of the system. For
optimum reliability in chiller applications, the flow measurement needs to be made on the warmer side of the system.
Temperature Probe
Cold Return
Cold
Heat Energy
Consumer
Temperature Probe
Hot Flow
The sockets on the Electronics Module are marked Red (Hot) and Blue (Cold).
This defines the location of the temperature sensors on installations where heat is being extracted from the system.
Note in the figure above, a heating system is depicted, but the same notion of temperature applies to a chiller system. In this case
the 'cold' sensor will be placed on the flow pipe and the 'hot' sensor should be placed on the return pipe.
NOTICE
It must be kept in mind that this is the reading on the outside of the pipe, which may vary significantly from the actual fluid
temperature, especially if the pipe material is of some type of insulating
material. This does not necessarily invalidate energy readings since the readings are dependent on the temperature differential,
not the absolute temperature. It is the responsibility of the installer to ensure the differential temperature readings are as accurate
as possible. This may necessitate covering the sensors with insulating material to ensure drafts and differences in ambient
temperature are minimized for both sensors.
Return
Hot
Flow

Flow Sensor

Installation
23